html,
body {
    height: 100%;
}

* {
    margin: 0px;
    padding: 0px;
}

body {
    position: relative;
    background-image: url("../images/background/background-uploaded.jpg");
    background-size: 100% 100%;
}

::-webkit-scrollbar {
    display: none;
}

.img-tip {
    position: absolute;
    bottom: 0px;
    right: 0px;
    animation: comein 2s;
}

.feedback {
    position: absolute;
    bottom: -450px;
    left: 40%;
    width: 520px;
    height: 520px;
    transform: translateX(-50%);
    animation: upFloat 3s ease 1s forwards;
    background-image: url("../images/background/balloon404.png");
    background-size: 100% 100%;
}

.tip-text {
    position: absolute;
    left: 50%;
    height: 26px;
    width: 60px;
    bottom: 67px;
    transform: translate(-63%, -47%);
    color: #adaaaa;
    background-color: #e3e0f8;
    border: 1px #61677b solid;
    border-radius: 4px;
    box-shadow: 0px 1px 3px #2b2a2a;
    font-size: 14px;
    line-height: 26px;
    text-align: center;
    cursor: pointer;
}

.tip-text:hover {
    background-color: #d872d3;
    box-shadow: 0px 1px 3px #b367af;
    color: white;
}

.backwords button {
    display: none;
    position: absolute;
    left: 39.5%;
    top: 68%;
    transform: translate(-50%, -50%);
    width: 100px;
    height: 40px;
    font-size: 18px;
    line-height: 40px;
    text-align: center;
    border: 1px #628bb9 solid;
    color: #adaabb;
    border-radius: 3px;
    background-image: linear-gradient(#ccdbfc, #c2eff4);
    animation: flickering 3s 1s ease;
    cursor: pointer;
}

.backwords button:hover {
    background-image: none;
    background-color: #d872d3;
    box-shadow: 0px 1px 3px #b367af;
    color: white;
}


/*动画部分*/

@keyframes comein {
    0% {
        opacity: 0;
    }
    100% {
        opacity: 1;
    }
}

@keyframes upFloat {
    0% {
        bottom: -450px;
    }
    100% {
        bottom: 180px;
    }
}

@keyframes flickering {
    0% {
        opacity: 0.2;
    }
    12.5% {
        opacity: 1;
    }
    25% {
        opacity: 0.3;
    }
    37.5% {
        opacity: 1;
    }
    50% {
        opacity: 0.3;
    }
    62.5% {
        opacity: 1;
    }
    75% {
        opacity: 0.5;
    }
    100% {
        opacity: 1;
    }
}